arm/musicpal: use memdev for RAM

memory_region_allocate_system_memory() API is going away, so
replace it with memdev allocated MemoryRegion. The later is
initialized by generic code, so board only needs to opt in
to memdev scheme by providing
  MachineClass::default_ram_id
and using MachineState::ram instead of manually initializing
RAM memory region.

PS:
 while at it add check for user supplied RAM size and error
 out if it mismatches board expected value.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200219160953.13771-25-imammedo@redhat.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/hw/arm/musicpal.c b/hw/arm/musicpal.c
index dc551bb0c0..db8b03cb83 100644
--- a/hw/arm/musicpal.c
+++ b/hw/arm/musicpal.c
@@ -32,6 +32,7 @@
 #include "sysemu/runstate.h"
 #include "exec/address-spaces.h"
 #include "ui/pixel_ops.h"
+#include "qemu/cutils.h"
 
 #define MP_MISC_BASE            0x80002000
 #define MP_MISC_SIZE            0x00001000
@@ -1589,16 +1590,21 @@ static void musicpal_init(MachineState *machine)
     int i;
     unsigned long flash_size;
     DriveInfo *dinfo;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
     MemoryRegion *address_space_mem = get_system_memory();
-    MemoryRegion *ram = g_new(MemoryRegion, 1);
     MemoryRegion *sram = g_new(MemoryRegion, 1);
 
+    /* For now we use a fixed - the original - RAM size */
+    if (machine->ram_size != mc->default_ram_size) {
+        char *sz = size_to_str(mc->default_ram_size);
+        error_report("Invalid RAM size, should be %s", sz);
+        g_free(sz);
+        exit(EXIT_FAILURE);
+    }
+
     cpu = ARM_CPU(cpu_create(machine->cpu_type));
 
-    /* For now we use a fixed - the original - RAM size */
-    memory_region_allocate_system_memory(ram, NULL, "musicpal.ram",
-                                         MP_RAM_DEFAULT_SIZE);
-    memory_region_add_subregion(address_space_mem, 0, ram);
+    memory_region_add_subregion(address_space_mem, 0, machine->ram);
 
     memory_region_init_ram(sram, NULL, "musicpal.sram", MP_SRAM_SIZE,
                            &error_fatal);
@@ -1714,6 +1720,8 @@ static void musicpal_machine_init(MachineClass *mc)
     mc->init = musicpal_init;
     mc->ignore_memory_transaction_failures = true;
     mc->default_cpu_type = ARM_CPU_TYPE_NAME("arm926");
+    mc->default_ram_size = MP_RAM_DEFAULT_SIZE;
+    mc->default_ram_id = "musicpal.ram";
 }
 
 DEFINE_MACHINE("musicpal", musicpal_machine_init)